Note the short, but graduated tail, white on the upper rump, and white on the throat. Not notable in the observations but observed in the field was large size but calls good for White-rumped Swift.
This bird was discovered dead, lying on the railing of the wooden boardwalk leading into the Simud Hitam ("Black Cave") of the Gomantong Cave system.
These birds were observed nesting on the ceiling, inside the Simud Hitam ("Black Cave") of the Gomantong Cave system.